US878067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing-head.
Assignee: Oil Well Supply Co
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Filing: 1907-11-29
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Granted: 1908-02-04
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Expires: 1927-11-29
Abstract
No abstract record available.
Inventors
- 👤 David K Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:22
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1911-02-03 | 1911-08-05 | 1912-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-02-03 | 1915-08-05 | 1916-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-02-03 | 1919-08-05 | 1920-02-04 | $7700.00 | Window Closed / Lapsed |